Flask



FIG. 1 is a perspective view of my new design for a flask.

FIG. 2 is a top view of my new design for the flask in FIG. 1.

FIG. 3 is a front elevation view of my new design for the flask in FIG. 1; the rear elevation view is the mirror image of the front elevation view.

FIG. 4 is a right side elevational view of my new design for the flask in FIG. 1.

FIG. 5 is a left side elevational view of my new design for the flask in FIG. 1; and,

FIG. 6 is a bottom view of my new design for the flask in FIG. 1.

The broken lines shown in the drawing views are included for the purpose of showing environmental structure that forms no part of the claimed design. 

The ornamental design for a flask, as shown and described. 